I like the musculature of the 89 suit more because it doesn't seem so.. sexy. And it's mostly just the torso that's muscled, the arms and legs aren't, as far as I know. Plus the anatomy seems kind of off on the Forever suit, like the abdomen muscles are too high up.

The abdomen muscles are just fine on the Panther suit, it's almost on the same location as the '89 suit. As far as anatomy goes on the torso, (and the entire suit, obviously) the Panther is more accurate because it includes the entire muscle group Rectus Abdominis. Because of it, it doesn't leave a huge gap down to the legs/cod like it does on the '89. Kilmer didn't have to wear his belt as high up as Keaton did.